Spectroelectrochemical study on the copolymerization of o-aminophenol and aminoterephthalic acid

Abstract

The electrochemical copolymerization of aminoterephthalic acid (ATA) and o-aminophenol (OAP) was carried out on platinum electrodes in acidic medium. The obtained material, poly(ATA-co-OAP), can be deposited by cyclic scanning of the potential in a wide potential range and shows significant electroactivity. However, it was observed that a copolymer with less overoxidation defects is obtained at inversion potentials where only OAP monomer (and not ATA monomer) is oxidized. The successful incorporation of unoxidized ATA monomers to the growing copolymer chain was confirmed by in situ FTIR spectroscopy and XPS, which suggested a monomer ratio close to 1:2 (ATA:POAP) within the obtained copolymer material. The redox switching of poly(ATA-co-OAP) in acidic medium involves reversible benzenoidquinoid and phenoxazine-phenoxazone conversions but carboxylic groups do not participate actively on these transformations.

Electrochemical functionalization of single wall carbon nanotubes with phosphorus and nitrogen species

“…A third peak at around 402 eV is also observed in all the potentials. This peak can be associated with more oxidized nitrogen species [47,48]. These oxidized nitrogen species increase significantly in the SWCNT modified at 1.8 V, in agreement with what has been observed in other amine-containing molecules, electrochemically attached on different materials surfaces [49,50].…”

“…7 presents the XPS N1s spectra for the SWCNT modified at different upper potential limits, showing different species depending on the applied potential. The region between 398.5 and 400.1 eV can be assigned to neutral amines and imines species, respectively, generated during the oxidation of 4-APPA which are also observed in PANI, and are in agreement with the formation of oligomer/polymeric chains [40,46,47]. A third peak at around 402 eV is also observed in all the potentials.…”

Synthesis of Phosphorus-Containing Polyanilines by Electrochemical Copolymerization

“…These species are usually present in PANI chains (see Figure S9) [18]. The third component (N 3 ) appearing at a binding energy close to 401.6 eV could be related to the presence of nitrogen at a higher oxidation state, specifically to positively charged nitrogen in polymeric films generated during electrooxidation [42,45]. On the other hand, N1s spectra in Figure 8 for PANI-2APPA and PANI-4APPA copolymers could be deconvoluted into three main contributions in all cases, which could be assigned to different nitrogen species.…”

Synthesis and characterization of polymer/V2O5 composites based on poly(2‐aminodiphenylamine)

“…In poly-PD and poly(ANI-co-PD) those contributions are more important as consequence of the over oxidation in the polymer chains during the synthesis, in comparison with PANI/ V 2 O 5 composites (see Figure S1). [27,28] However, when vanadium is incorporated (see Figure 1B,D) contributions at lower binding energies at around 516.4 and 517.1 eV are observed, related with the vanadium species with oxidation states of V +4 and V +5 , respectively. [29,30] Eventually, the pristine nanoparticles of vanadium employed show a ratio O/V = 2.5, in agreement with the ratio found in the V 2 O 5 , thus only V +5 is present in the sample (see Figure S3).…”